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1)  vertical prestressed reinforcement
竖向预应力钢筋
1.
By the study of the auchorage technique experiment and the prestress loss test of vertical prestressed reinforcement, a practicable method for ensuring the offective vertical prestress of long span continuous rigid framed bridge is obtained, and the variational laws of vertical prestress loss are analyzed in the paper.
通过对竖向预应力粗钢筋的锚固工艺试验及预应力损失的检测 ,得到了保证有效预应力的可行方法 ,分析了竖向预应力钢筋应力损失的规律 ,可为类似桥梁预应力钢筋施工提供参
2)  vertical prestressing bar
竖向预应力筋
1.
According to existing norms,the ratio of the vertical prestress loss to different length of the vertical prestressing bars is analyzed.
竖向预应力筋在连续刚构桥中主要起控制腹板主拉应力的作用,根据现行规范分析了不同长度竖向预应力筋的损失比例,提出了减小竖向预应力损失的几种措施;针对目前设计中采用的滞后张拉竖向预应力筋的方法,开展了3种滞后张拉竖向预应力筋方式对连续刚构桥受力的影响分析,在此基础上提出了竖向预应力合理张拉时间的建议;建立了箱梁腹板的细部有限元模型,详细地分析了腹板在单根竖向预应力筋作用下的应力分布情况和腹板上缘出现拉应力的原因,据此提出避免上缘拉应力出现的构造措施。
3)  vertical prestress anchoring
竖向预应力筋锚固
4)  vertical prestress
竖向预应力
1.
Study on the vertical prestress loss of the prestress concrete box girder bridge web;
预应力混凝土箱梁桥腹板竖向预应力损失研究
2.
Test of vertical prestress loss and analysis research on it;
竖向预应力损失的实测与分析研究
3.
The vertical prestress applied to webs of concrete box girder is studied.
对混凝土箱梁腹板竖向预应力进行研究。
5)  vertical pre-stress
竖向预应力
1.
In this paper,starting from analysis of the sensitivity of slant box beam web cracks to vertical pre-stress,the dynamic mechanism of the effective reduction in main web pulling stress by vertical pre-stress is explained.
从箱梁腹板斜裂缝对竖向预应力的敏感性分析出发,阐明竖向预应力有效削减腹板主拉应力的力学机理,探讨现阶段国内外竖向预应力设置方法及其优缺点,提出用碳纤维力筋CFRP取代传统的精轧螺纹钢建立有效预应力的新方法,尝试设计其专用锚具及施工工艺。
2.
The distribution of ring pre-stress, anchoring steel beam and pre-stress, vertical pre-stress of the anchoring zone of the main tower in Songhuajiang cable stayed bridge are introduced and the corresponding construction technologies are clarified in the paper.
介绍哈尔滨绕城公路松花江斜拉桥主塔锚固区环向预应力、锚固钢横梁及预应力、竖向预应力的布置情况及有关的预应力施工工艺。
3.
The vertical pre-stressed reinforcement installed in the pre-stressed concrete continuous (rigid frame) box beam bridge is to decrease and control the main tension stress of the web and to prevent the creaking.
预应力混凝土连续(刚构)箱梁桥设置竖向预应力筋是为了减少和控制腹板主拉应力、防止开裂,然而在设置了竖向预应力后。
6)  vertical prestressing
竖向预应力
1.
Based on the long-term field measurement of vertical prestress losses in the box girder of a long-span PC continuous bridge,a detailed analysis of the loss of the vertical prestressing is conducted.
基于某大跨预应力混凝土连续箱梁桥腹板竖向预应力的现场长期测试结果,对箱梁竖向预应力的各种损失进行了分析。
补充资料:预应力钢筋张拉设备
      使预应力混凝土结构里的钢筋产生并保持预应力的设备。分手动、电动和液压传动张拉机等。液压张拉机拉力大、重量轻,使用灵活方便。按钢筋张拉工艺有先张法和后张法两种。先张法用的夹具可以重复使用;后张法用的锚具将成为构件的一部分,不能取下再用。常采用不同的夹具来锚固各种钢筋,圆锥形夹具用于锚固直径12~16毫米的钢筋,镦头梳筋板夹具适用于板类构件中张拉低碳冷拔钢丝,波形夹具可成批张拉和锚固钢丝,螺杆锥形夹具则用于钢筋束的后张自锚。作业时,钢筋的一端锚固,另一端由张拉机通过夹具把钢筋夹紧张拉。穿心式张拉机作业时将钢筋穿入,打开前油嘴,由液压泵把高压油送入后油嘴,使张拉缸后退,利用尾部锚具将钢筋锚固并张拉。张拉到所需应力值后,关闭后油嘴。前油嘴进油,活塞向前推出,顶压锚塞,使钢筋锚固。回程时,活塞靠弹簧复位,完成张拉。
  
  管类构件可采用环向预应力缠筋机,在管坯上缠绕预应力螺旋钢筋(见图)。作业时,管坯由卡盘夹持,通过调直张紧滚轮在管坯上绕4~5圈应力不大的螺旋钢筋,此后液压缸使两侧的张紧轮分开,钢筋便张拉到预定的应力值。此时管坯旋转,并开动小车,管体上就连续绕上预应力螺旋筋。螺距的大小由小车的行走速度来控制。
  
  
  随着预应力构件生产批量的增加,一些专用的连续张拉设备得到发展,其特点是成组张拉效率高,需要的张拉力较小,可双向交叉配筋,张拉均匀,易于实现自动化生产。
  

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